Current Electricity — Physics STD 12 Science — Question

A 6kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is.

Which of the following mirrors always forms a virtual and small image?

The magnetic field at a point x on the axis of a small bar magnet is equal to the field at a point y on the equator of the same magnet. The ratio of the distances of x and y from the centre of the magnet is

(a)

(b)

(c)

(d)

Two long parallel wires carrying equal current separated by 1m, exert a force of 2   on one another. The current flowing through them is

(a) 2.0 A

(b) 2.0

(c) 1.0 A

(d) 1.0

By a cell a current of 0.9 A flows through 2 ohm resistor and 0.3 A through 7 ohm resistor. The internal resistance of the cell is

(a) 0.5 Ω

(b) 1.0 Ω

(c) 1.2 Ω

(d) 2.0 Ω

What is the current in the circuit shown below

(a) 0 amp

(b)  amp

(c) 1 amp

(d) 0.10 amp

Diode can work as:

 Which waves are used by artificial satellites for communication?

Which among the following materials display higher magnetic susceptibility?